Enabling The Hold Temperature Display - Fluke 9103 User Manual

7.4.1
7.4.2
7.4.3
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tion explains the functions available for operating the temperature hold feature.
An example follows showing how to set up and use the hold feature to test a
switch.

Enabling the Hold Temperature Display

Pressing the "UP" button when the temperature is displayed enables the Hold
Temperature Display feature. The Hold Temperature Display shows the hold
temperature on the right and the switch status on the left. The status "c" means
the switch is closed and "o" means the switch is open. The status flashes when
the switch is in its active position (opposite the normal position). The hold tem-
perature display shows what the temperature of the well was when the switch
changed from its normal position to its active position. While the switch is in
the normal position the hold temperature will follow the well temperature.
If the Scan Control is "OFF" and the Hold Temperature Display is being used,
the temperature at which the switch is activated does not affect the set-point
temperature. However, if the Scan Control is "ON" and the Hold Temperature
Display is being used, the temperature at which the switch is activated is stored
as the new set-point temperature.
Operation of the hold temperature display is outlined below.
103.5C Well temperature display
U
Access hold display
c 103.5 Switch status and hold temperature
To return to the normal well temperature display press "DOWN".
Mode Setting
The Hold Temperature Display function is always in the automatic mode. In
this mode the normal position is set to whatever the switch position is when the
set-point is changed. For example, if the switch is currently open when the
set-point is changed, the closed position then becomes the new active position.
The normal position will be set automatically under any of the following condi-
tions, (1) a new set-point number is selected, (2) the set-point value is changed,
(3) a new set-point is set through the communications channels.
Switch Wiring
The thermal switch or cutout is wired to the calibrator at the two terminals on
the front of the calibrator labeled "SWITCH HOLD". The switch wires may be
connected to the terminals either way. Internally the black terminal connects to
ground. The red terminal connects to +5V through a 100 kΩ resistor. The cali-
brator measures the voltage at the red terminal and interprets +5V as open and
0V as closed.
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